In the viable plate count method, a measured sample of a culture is evenly spread across an agar surface and incubated. Each ________ on the agar surface represents one ________ from the sample.
A. generation; cell
B. cell; cell
C. colony; cell
D. cell; colony
E. species; colony
Answer: C
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_______________ are constructed of all four basic tissue types.
(a) Organs. (b) Systems. (c) Cells. (d) Organelles.
What cellular component of a sensory neuron would account for its specialization in response to physical or chemical cues?
A. the phospholipid composition of its plasma membrane B. the shape of the neuron C. the proteins present in its cytosol or on its plasma membrane D. both the shape of the cell and the proteins in its cytosol or membrane
Within a single molecule of water, as shown, bonds are formed between oxygen and hydrogen.
A. nuclear
B. hydrophobic
C. hydrogen
D. covalent
E. ionic
The leukocytes called natural killer lymphocytes
A) release prostaglandins and leukotrienes in response to microbes. B) increase in allergies and helminth infection. C) respond to the coating of a pathogen by complement. D) are nonspecific leukocytes that secrete toxins onto the surface of virally infected cells. E) are specialists in killing bacteria.